| Eric Nelson | e5b3a50 | 2013-03-11 08:44:53 +0000 | [diff] [blame] | 1 | U-Boot for the Boundary Devices Nitrogen6X and |
| 2 | Freescale i.MX6Q SabreLite boards |
| 3 | |
| 4 | This file contains information for the port of |
| 5 | U-Boot to the Boundary Devices Nitrogen6X and |
| 6 | Freescale i.MX6Q SabreLite boards. |
| 7 | |
| 8 | 1. Boot source, boot from SPI NOR |
| 9 | --------------------------------- |
| 10 | The configuration in this directory supports both the |
| 11 | Nitrogen6X and Freescale SabreLite board, but in a |
| 12 | different fashion from Freescale's implementation in |
| 13 | board/freescale/mx6qsabrelite. |
| 14 | |
| 15 | In particular, this image supports booting from SPI NOR |
| 16 | and saving the environment to SPI NOR. |
| 17 | |
| 18 | It does not support 'boot from SD' at offset 0x400 |
| 19 | except through the 'bmode' command. |
| 20 | http://lists.denx.de/pipermail/u-boot/2012-August/131151.html |
| 21 | |
| 22 | 2. Boots using 6x_bootscript on SATA or SD card |
| 23 | ----------------------------------------------- |
| 24 | The default bootcmd for these boards is configured |
| 25 | to look for and source a boot script named '6x_bootscript' |
| 26 | in the root of the first partition of the following |
| 27 | devices: |
| 28 | |
| 29 | sata 0 |
| 30 | mmc 0 |
| 31 | mmc 1 |
| 32 | |
| 33 | They're searched in the order listed above, trying both the |
| 34 | ext2 and fat filesystems. |
| 35 | |
| 36 | 2. Maintaining the SPI NOR |
| 37 | -------------------------- |
| 38 | A couple of convenience commands |
| 39 | |
| 40 | clearenv - clear environment to factory default |
| 41 | upgradeu - look and source a boot script named |
| 42 | '6x_upgrade' to upgrade the U-Boot version |
| 43 | in SPI NOR. The search is the same as for |
| 44 | 6x_bootscript described above. |
| 45 | |
| 46 | 3. Display support |
| 47 | ------------------ |
| 48 | U-Boot support for the following displays is configured by |
| 49 | default: |
| 50 | |
| 51 | HDMI - 1024 x 768 for maximum compatibility |
| 52 | Hannstar-XGA - 1024 x 768 LVDS (Freescale part number MCIMX-LVDS1) |
| 53 | wsvga-lvds - 1024 x 600 LVDS (Boundary p/n Nit6X_1024x600) |
| 54 | wvga-rgb - 800 x 480 RGB (Boundary p/n Nit6X_800x480) |
| 55 | |
| 56 | Since the ipuv3_fb display driver currently supports only a single display, |
| 57 | this code auto-detects panel by probing the HDMI Phy for Hot Plug Detect |
| 58 | or the I2C touch controller of the LVDS and RGB displays in the priority |
| 59 | listed above. |
| 60 | |
| 61 | Setting 'panel' environment variable to one of the names above will |
| 62 | override auto-detection and force activation of the specified panel. |
| 63 | |
| 64 | 4. Building |
| 65 | ------------ |
| 66 | |
| 67 | To build U-Boot for one of the Nitrogen6x or SabreLite board: |
| 68 | |
| 69 | make nitrogen6x_config |
| 70 | make u-boot.imx |
| 71 | |
| 72 | Note that 'nitrogen6x' is a placeholder. The complete list of supported |
| 73 | board configurations is shown in tha MAINTAINERS file: |
| 74 | nitrogen6q i.MX6Q/6D 1GB |
| 75 | nitrogen6dl i.MX6DL 1GB |
| 76 | nitrogen6s i.MX6S 512MB |
| 77 | nitrogen6q2g i.MX6Q/6D 2GB |
| 78 | nitrogen6dl2g i.MX6DL 2GB |
| 79 | nitrogen6s1g i.MX6S 1GB |
| 80 | |
| 81 | The -6q variants support either the i.MX6Quad or i.MX6Dual processors |
| 82 | and are configured for a 64-bit memory bus at 1066 MHz. |
| 83 | |
| 84 | The -6dl variants also use a 64-bit memory bus, operated at 800MHz. |
| 85 | |
| 86 | The -6s variants use a 32-bit memory bus at 800MHz. |
| 87 | |
| 88 | If you place the u-boot.imx into a single-partition SD card |
| 89 | along with a binary version of the boot script 6x_upgrade.txt, |
| 90 | you can program it using 'upgradeu': |
| 91 | |
| 92 | U-Boot> run upgradeu |